<template>
  <div>
    <el-row>
      <el-col :span="12"><h2>原始图表</h2></el-col>
      <el-col :span="12"><h2>改动后的图表</h2></el-col>
    </el-row>
    <el-row>
      <el-col :span="12">
        <div id="echart1" class="echartWh"></div>
      </el-col>
      <el-col :span="12">
        <div id="echart2" class="echartWh"></div>
      </el-col>
    </el-row>
  </div>
</template>

<script>

import * as echarts from 'echarts'

export default {
  name: 'echart4',
  mounted() {
    this.initChart1()
    this.initChart2()
  },
  methods: {
    initChart1() {
      var chartDom = document.getElementById('echart1')
      var myChart = echarts.init(chartDom)
      var option

      let xAxisData = []
      let data1 = []
      let data2 = []
      let data3 = []
      let data4 = []
      for (let i = 0; i < 10; i++) {
        xAxisData.push('Class' + i)
        data1.push(+(Math.random() * 2).toFixed(2))
        data2.push(+(Math.random() * 5).toFixed(2))
        data3.push(+(Math.random() + 0.3).toFixed(2))
        data4.push(+Math.random().toFixed(2))
      }
      var emphasisStyle = {
        itemStyle: {
          shadowBlur: 10,
          shadowColor: 'rgba(0,0,0,0.3)'
        }
      }
      option = {
        legend: {
          data: ['bar', 'bar2', 'bar3', 'bar4'],
          left: '10%'
        },
        brush: {
          toolbox: ['rect', 'polygon', 'lineX', 'lineY', 'keep', 'clear'],
          xAxisIndex: 0
        },
        toolbox: {
          feature: {
            magicType: {
              type: ['stack']
            },
            dataView: {}
          }
        },
        tooltip: {},
        xAxis: {
          data: xAxisData,
          name: 'X Axis',
          axisLine: {onZero: true},
          splitLine: {show: false},
          splitArea: {show: false}
        },
        yAxis: {},
        grid: {
          bottom: 100
        },
        series: [
          {
            name: 'bar',
            type: 'bar',
            stack: 'one',
            emphasis: emphasisStyle,
            data: data1
          },
          {
            name: 'bar2',
            type: 'bar',
            stack: 'one',
            emphasis: emphasisStyle,
            data: data2
          },
          {
            name: 'bar3',
            type: 'bar',
            stack: 'two',
            emphasis: emphasisStyle,
            data: data3
          },
          {
            name: 'bar4',
            type: 'bar',
            stack: 'two',
            emphasis: emphasisStyle,
            data: data4
          }
        ]
      }
      myChart.on('brushSelected', function (params) {
        var brushed = []
        var brushComponent = params.batch[0]
        for (var sIdx = 0; sIdx < brushComponent.selected.length; sIdx++) {
          var rawIndices = brushComponent.selected[sIdx].dataIndex
          brushed.push('[Series ' + sIdx + '] ' + rawIndices.join(', '))
        }
        myChart.setOption({
          title: {
            backgroundColor: '#333',
            text: 'SELECTED DATA INDICES: \n' + brushed.join('\n'),
            bottom: 0,
            right: '10%',
            width: 100,
            textStyle: {
              fontSize: 12,
              color: '#fff'
            }
          }
        })
      })
      option && myChart.setOption(option)
      myChart.on('click', function(params) {
        window.open('https://www.baidu.com/s?wd=' + encodeURIComponent(params.name))
      })
    },
    initChart2() {
      var chartDom = document.getElementById('echart2')
      var myChart = echarts.init(chartDom)
      var option

      let xAxisData = []
      let data1 = []
      let data2 = []
      let data3 = []
      let data4 = []
      for (let i = 0; i < 10; i++) {
        xAxisData.push('Class' + i)
        data1.push(+(Math.random() * 2).toFixed(2))
        data2.push(+(Math.random() * 5).toFixed(2))
        data3.push(+(Math.random() - 2).toFixed(2))
        data4.push(+Math.random().toFixed(2))
      }
      var emphasisStyle = {
        itemStyle: {
          shadowBlur: 10,
          shadowColor: 'rgba(0,0,0,0.3)'
        }
      }
      option = {
        legend: {
          data: ['bar', 'bar2', 'bar3', 'bar4'],
          left: '10%'
        },
        brush: {
          toolbox: ['rect', 'polygon', 'lineX', 'lineY', 'keep', 'clear'],
          xAxisIndex: 0
        },
        toolbox: {
          feature: {
            magicType: {
              type: ['stack']
            },
            dataView: {}
          }
        },
        tooltip: {},
        xAxis: {
          data: xAxisData,
          name: 'X Axis',
          axisLine: {onZero: true},
          splitLine: {show: false},
          splitArea: {show: false}
        },
        yAxis: {},
        grid: {
          bottom: 100
        },
        series: [
          {
            name: 'bar',
            type: 'bar',
            stack: 'one',
            emphasis: emphasisStyle,
            data: data1
          },
          {
            name: 'bar2',
            type: 'bar',
            stack: 'one',
            emphasis: emphasisStyle,
            data: data2
          },
          {
            name: 'bar3',
            type: 'bar',
            stack: 'one',
            emphasis: emphasisStyle,
            data: data3
          },
          {
            name: 'bar4',
            type: 'line',
            stack: 'one',
            emphasis: emphasisStyle,
            data: data4
          }
        ]
      }
      myChart.on('brushSelected', function (params) {
        var brushed = []
        var brushComponent = params.batch[0]
        for (var sIdx = 0; sIdx < brushComponent.selected.length; sIdx++) {
          var rawIndices = brushComponent.selected[sIdx].dataIndex
          brushed.push('[Series ' + sIdx + '] ' + rawIndices.join(', '))
        }
        myChart.setOption({
          title: {
            backgroundColor: '#333',
            text: 'SELECTED DATA INDICES: \n' + brushed.join('\n'),
            bottom: 0,
            right: '10%',
            width: 100,
            textStyle: {
              fontSize: 12,
              color: '#fff'
            }
          }
        })
      })
      option && myChart.setOption(option)
    }
  }
}
</script>

<style scoped>
.echartWh {
  width: 600px;
  height: 600px;
}
</style>
